php文件路径如何获取文件名（代码示例）

$file = '/www/htdocs/inc/lib.inc.php';
$filename = basename($file);
echo $filename, &#39;<br/>&#39;;//  lib.inc.php
$filename = str_replace(strrchr($filename, &#39;.&#39;), &#39;&#39;, $filename);
echo $filename, &#39;<br/>&#39;;//  lib.inc

$file = '/www/htdocs/inc/lib.inc.php';
$path_parts = pathinfo($file);
echo &#39;目录名称&#39; . $path_parts[&#39;dirname&#39;], &#39;<br/>&#39;;  //  /www/htdocs/inc
echo &#39;文件全名&#39; . $path_parts[&#39;basename&#39;], &#39;<br/>&#39;; //  lib.inc.php
echo &#39;文件后缀&#39; . $path_parts[&#39;extension&#39;], &#39;<br/>&#39;;//  php
echo &#39;文件名称&#39; . $path_parts[&#39;filename&#39;], &#39;<br/>&#39;; //  lib.inc         // PHP >= 5.2.0
echo &#39;目录名称&#39; . pathinfo($file, PATHINFO_DIRNAME), &#39;<br/>&#39;;  //  /www/htdocs/inc
echo &#39;文件全名&#39; . pathinfo($file, PATHINFO_BASENAME), &#39;<br/>&#39;; //  lib.inc.php
echo &#39;文件后缀&#39; . pathinfo($file, PATHINFO_EXTENSION), &#39;<br/>&#39;;//  php
echo &#39;文件名称&#39; . pathinfo($file, PATHINFO_FILENAME), &#39;<br/>&#39;; //  lib.inc         // PHP >= 5.2.0